Problem defining single quotation mark as a token

[Andrew Butterfield]

Dear all,

 I am trying to use BNFC to develop a parser for a process algebra called CCS.

I am following a concrete grammar developed by others.

This distinguishes input labels (a) from output labels ('a).

I can define a grammar that is accepted without any errors,

and compiles.

The key line is

Output. Action ::= "'" Label ;

When I run the test program with input

set V = { 'a } ;

I get: syntax error  at line 4, column 11 before `''

Any ideas?

I am using 2.9.2

[Andrew Butterfield]

Dear all,

 I resolved the issue - it was an error elsewhere - it wasn;t the issue about how to specify the sing-quote character that I thought it was...

Thanks,

  Andrew

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Andrew Butterfield
Dublin, Ireland